Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/boards/api/onboarding.go

@@ -0,0 +1,87 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/gorilla/mux"
+
+	"github.com/mattermost/mattermost-server/v6/server/boards/model"
+)
+
+func (a *API) registerOnboardingRoutes(r *mux.Router) {
+	// Onboarding tour endpoints APIs
+	r.HandleFunc("/teams/{teamID}/onboard", a.sessionRequired(a.handleOnboard)).Methods(http.MethodPost)
+}
+
+func (a *API) handleOnboard(w http.ResponseWriter, r *http.Request) {
+	// swagger:operation POST /team/{teamID}/onboard onboard
+	//
+	// Onboards a user on Boards.
+	//
+	// ---
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: teamID
+	//   in: path
+	//   description: Team ID
+	//   required: true
+	//   type: string
+	// security:
+	// - BearerAuth: []
+	// responses:
+	//   '200':
+	//     description: success
+	//     schema:
+	//       type: object
+	//       properties:
+	//         teamID:
+	//           type: string
+	//           description: Team ID
+	//         boardID:
+	//           type: string
+	//           description: Board ID
+	//   default:
+	//     description: internal error
+	//     schema:
+	//       "$ref": "#/definitions/ErrorResponse"
+	teamID := mux.Vars(r)["teamID"]
+	userID := getUserID(r)
+
+	if !a.permissions.HasPermissionToTeam(userID, teamID, model.PermissionViewTeam) {
+		a.errorResponse(w, r, model.NewErrPermission("access denied to create board"))
+		return
+	}
+
+	isGuest, err := a.userIsGuest(userID)
+	if err != nil {
+		a.errorResponse(w, r, err)
+		return
+	}
+	if isGuest {
+		a.errorResponse(w, r, model.NewErrPermission("access denied to create board"))
+		return
+	}
+
+	teamID, boardID, err := a.app.PrepareOnboardingTour(userID, teamID)
+	if err != nil {
+		a.errorResponse(w, r, err)
+		return
+	}
+
+	response := map[string]string{
+		"teamID":  teamID,
+		"boardID": boardID,
+	}
+	data, err := json.Marshal(response)
+	if err != nil {
+		a.errorResponse(w, r, err)
+		return
+	}
+
+	jsonBytesResponse(w, http.StatusOK, data)
+}